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The western hemisphere is west of the prime meridian and east of the International Date Line.
The meridian that runs through Greenwich, England, is internationally accepted as the line of 0 degrees longitude, or prime meridian. The antimeridian is halfway around the world, at 180 degrees. It is the basis for the International Date Line.
Longitudes for the Earth and Moon are measured from their prime meridian at 0° to 180° east and to 180° west. For all other Solar System bodies, longitude is measured from 0° (their prime meridian) to 360°. West longitudes are used if the rotation of the body is direct, that is, it follows the right hand rule.
The prime meridian is the reference for all lines of longitude, the imaginary vertical lines that divide the Earth’s surface. The opposite meridian is the 180 degree line of longitude, which is 180 degrees both east and west of the prime meridian.
Meridian (geography) A ( geographical) meridian (or line of longitude) is the half of an imaginary great circle on the Earth’s surface, terminated by the North Pole and the South Pole, connecting points of equal longitude, as measured in angular degrees east or west of the Prime Meridian.
As per the knowledge Greenwich Meridian is known as the prime Meridian, according to which the longitude can be defined as 180 degree east from the prime Meridian and 180 degrees west from the prime Meridian. The world map with latitude can be denoted in degrees and the equator that can be taken as zero degree.
Longitude is a measurement of location east or west of the prime meridian at Greenwich, London, England, the specially designated imaginary north-south line that passes through both geographic poles and Greenwich. Longitude is measured 180° both east and west of the prime meridian.
For the meridian often called the Prime Meridian, see IERS Reference Meridian. A prime meridian is the meridian (a line of longitude) in a geographic coordinate system at which longitude is defined to be 0°. Together, a prime meridian and its anti-meridian (the 180th meridian in a 360°-system) form a great circle.